Ratchet lift



E. L. BENOIT RATCHET LIFT Fi led May 31, 1928 2 Sheets-Sheet l J l Iii iiq'azaz/ 2 E. L. BENOIT RATCHET LIFT Jan. 5, 1932.

Filed May 31, 1928 2 Sheets-Sheet 2 FIq'uRE 4 Fig a B5 M VF/V 7 i A ZTOR/I/AZ/ reamed .lan.5,1932 e 1 39,523.

STATES PATENT? OFFICE";

Application filed May 31, 19285 Serial No. $81,816.

It is one object of the invention to provide A- lever is shown at 8 pivotally mounted a device of the character indicated that will as at 9 to the bar 1 substantially midway be light, strong, and durable, and as positive between the guides.j2,. and to the end of the in action when lowering a load as when raisshort'arm of the lever is pivotally mounted ing it. as at 10 adog ll. Inthe outerendofthe .55,

It is also an object of the invention to prodog '11 is the pin" 12 by meansof whichit. vide a device of the character indicated that engagestheratchet bar to be described, and will be substantially rigid when supporting on the freeend of the dog is .an upstanding a suspend-ed weight, and one that is provided plate 13. On the face of this plate 13 directed with both actuating and supporting dogs to end of acoiledspring 14:, the other end of disengage the same from a ratchet at predethe-spring being formed into a loop 15 adapt,-

termined periods. 7 ed to engage .the. finger 7 .on dog 4.

It is a still further object of the invention 1S ShOWIl & ratchet. bfbl" S1idlll017r ith iti l ting means cooperating toward the pivotal point 10 is mountedone 60.

15 to provide adevice of the character indicated mounted in'guides 2 with its rear edge en- 65.. I

that will be economical to manufacture, simg ging the bar 1 and having upwardly. and ple in construction, andhighly efiicientin its inwardly. directed, notches as 17. formed in practical application. its outer edge. In the present case the lower.

In the drawings: end of'the bar is formed into ahook 18 by Figure 1 is a side elevation of the device. means of which it may be attac ed to a 7 a Figure 2 is an enlarged side elevation of Weight to be raised.

a portion of the device with the dog throwing Withthe support indicated bythe arrow.

means in position for throwing the upper dog 19 and th W g in i tedby the r w 2 when the operating lever is forc d downthe. operation of the device is as follows, the wardly. i

Figure 3 is a similar view showing the up- 4: s shown in Figure 1. Since both dogs 4L per dog when thrown by the dog throwing and ll are overbalanced at least one of them means and with the lower dog engaging th is in engagement with the ratchet bar at all ratchet bar. times. By raising the lever 8 the dog. 11 will spring 1 1 being disconnected from the. dog75,

Figure 4 is another similarview showingf Slide .d h to g g h .IIQXFIOWBI 3 the relative positions of the parts when the n ch, and by forcing. the lever downward-.-

lever is raised to permit the upper dog to en- 1y the bar 16 will be raised relative tobar 1.

gage the ratchet bar and support the load. and the =upperfdog 4 will slide over the bar I Figure 5 is a detail perspective view of the 16 to. engage the next lower notch. Repeu per do tition of this action will of course kee the P e P Figure 6 is a detail perspective of the lower bar 16 moving upwardly. dog and aportion of the ratchet bar and For lowering the bar 16 relative to bar 1 lever. g the loop 15 on spring 14 is placed in engage- Referring now more particularly to the ment with the finger 7 on dog 4 as indicated 40 drawings, I show at 1 a supporting bar fitted in dotted lines at 21. If now the lever 8 is with guides 2 and provided with a hook at swung downwardly a little so that the pin its upper end as at 3 whereby it may be sus- 6 in dog t'will clear the point of the notch in pended from any suitable fixed member not which it rests then the spring 14:, bowed outshown. Pivotally mounted on the bar]. and wardly by this action, will throw the dog,

just below the upper guide is a dog l, its outwardly and clear of the. ratchet as shown pivotal point being indicated at 5. In the in Figure 3, the ratchet bar 16 and its load outer end of the dog is the pin 6 by means being now supported entirely by the lever of which it engages the ratchet bar hereinand dog 11. The load may now be lowered after described, and on the free end of the by swinging the. lever 8 upwardly, but when dog 4 is an upstanding finger 7. the lever approaches the position shown in Figure 4 it places ust enough tension on the spring 14 to again throw the dog 4 into engagement with a notch in the ratchet bar and hold the dog 11 free as shown. WVhen the lever is again swung downwardly the spring 14 is bowed outwardly and the dog 11 moves into engagement with a notch, whereupon the bar 16 is raised enough to permit the free ing of dog 4 and the bar 16 is lowered another notch, the action being repeated as desired.

It may now be seen that by assembling the several elements in the manner above set forth the same operation of the lever 8 will either raise or lower the load, depending entirely upon whether or not the spring 14 is connected to'the dog 4;

It will be noted that'whenev'er the device is operated to bow the spring as described its tendency is to urge the upper dog out of the ratchet and the lower one into the ratchet,

while straightening the'spring urges the up-- per dog intothe ratchet and the lower one out of the ratchet.

It is to be understood, of course, that while I have herein shown and described but one specific embodiment of the invention. changes in form, construction, and method of assembly and operation may be made within the scope of the appended claim.

I claim:

A device of the character described comprising a pair ofrelatively slidable bars and meansfor supporting one bar relative to the other bar, one bar having a ratchet formed therein, a dog mounted on the other bar. to normally engage-said ratchet, a lever fulcrumed on the second bar inspaced relation tosaid dog and having a short arm overlying the ratchet bar,a dog mounted on the short 1 arm of the lever to normallyengage said ratchet, and resilient means inserted between the dogs to urge them in opposite directions about their pivotal mountings and to alternately displace one dog and then the other from engagement with :the ratchet upon movement of the'lever. Y

EDMUND L. BENOIT. 

